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Supplementary balance sheet information - Schedule of Condensed Balance Sheet (Details) - USD ($)
$ in Millions
Jun. 28, 2020
Dec. 31, 2019
Accounts and other receivables    
Trade receivables $ 52.6 $ 52.4
Related parties 2.0 2.7
Prepayments and accrued income 3.8 6.7
Derivative financial instruments 0.1 0.3
Other receivables 4.4 4.2
Total accounts and other receivables 62.9 66.3
Inventories    
Raw materials and supplies 35.1 33.4
Work-in-process 30.5 32.2
Finished goods 27.6 28.9
Total inventories 93.2 94.5
Other current assets    
Held-for-sale assets 3.7 3.9
Income tax receivable 0.3 1.1
Total other current assets 4.0 5.0
Property, Plant and Equipment [Abstract]    
Total property, plant and equipment 355.5 364.7
Accumulated depreciation and impairment (262.5) (265.8)
Total property, plant and equipment, net 93.0 98.9
Other current liabilities    
Contingent liabilities 6.2 6.6
Derivative financial instruments 0.2 0.0
Operating lease liability 3.1 3.3
Other current liabilities 3.1 2.4
Total other current liabilities 12.6 12.3
Other non-current liabilities    
Contingent liabilities 1.1 0.9
Operating lease liability 9.9 11.7
Other non-current liabilities 0.1 0.2
Total other non-current liabilities 11.1 12.8
Land, buildings and leasehold improvements    
Property, Plant and Equipment [Abstract]    
Total property, plant and equipment 68.5 68.1
Machinery and equipment    
Property, Plant and Equipment [Abstract]    
Total property, plant and equipment 279.1 287.7
Construction in progress    
Property, Plant and Equipment [Abstract]    
Total property, plant and equipment $ 7.9 $ 8.9